I just think there g3 spoke pattern doesn't make any sense..perhaps fullcrum will bring them with a more sensible pattern (;
G3 is more than a simple cosmetic grouping of spokes. The Mega G3 pattern allows for an almost perfectly tangential pull on the drive side of the hub (slightly less so in the previous non-Mega G3 version, admittedly), it concentrates left- and right-pulling stresses in a very small part of the rim so eliminating the tendency for a rim with sparse spoking at very high tensions to "S" slightly and it requires that the rim is not actually round before tensioning of the spokes, so utilising the rim as a more integral part of the tensioned structure. All these factors build a wheel that transmits torque more effectively than other spoking patterns.
An additional effect of G3 is in how the spoking pattern transmits loads through the spokes as the wheel rolls. If you measure the tensions in a static, loaded wheel (ie with a rider's weight on it) of conventional design, then do the same for first a 2:1 design like Fulcrum, then a G3 design, you'll see that the variation in tension between the tightest spokes in the wheel (at more or less the 7 and 5 o'clock positions), and those in the lowest tensioned spokes (those at the six o'clock position) is far less in a G3 design, with 2:1 coming between, though closer to G3 than to a conventional wheel. Less tension cycling is good both for spoke durability and subtly changes the way that stresses pass through the wheel as a whole, making for a very high degree of torsional rigidity and lateral resistance.
If you want to see the practical back-up for that, you'll need to attend a Campag G3 wheel building course with us where you can do the practical tests that demonstrate the above ...
Head tech at Velotech Cycling Ltd, Campag Main UK ASC